Anas bin Sirin (may Allah have mercy on him) relates: I heard Sayyiduna Anas bin Malik (may Allah be pleased with him) say: A man of the Ansar said to the Prophet (peace and blessings be upon him): I am not able to pray standing with you (in congregation). He was a heavy-bodied man. He prepared food for the Prophet (peace and blessings be upon him), invited him to his house, spread out a mat for him and cleaned the edge of the mat. The Messenger of Allah (peace and blessings be upon him) prayed two rak'ahs on it. A man from the family of al-Jarud said to Sayyiduna Anas bin Malik (may Allah be pleased with him): Did the Messenger of Allah (peace and blessings be upon him) pray the forenoon (Duha) prayer? He said: I never saw him (peace and blessings be upon him) pray it except on that day.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3681